About the Electric Power Calculator
Find electric power and energy use from voltage and current. This tool is free, works in your browser and needs no sign-up.
How to use the Electric Power Calculator
Enter the voltage in volts and the current in amps.
Formula used
Power (W) = Voltage × Current. Energy per hour (kWh) = Power ÷ 1000.
Example
With Voltage (V) 230, Current (A) 5, the calculator shows: Power = 1,150 W; Energy per hour = 1.15 kWh.
Frequently asked questions
Is the Electric Power Calculator free to use?
Yes. It is completely free and you can use it as many times as you like.
How accurate is the Electric Power Calculator?
The calculator uses standard formulas, so the maths is exact. Real life results can differ because of fees, taxes, rounding or personal factors, so treat the answer as an estimate.
Do you store the numbers I enter?
No. All calculations run in your browser. The values you type are not sent to our server.
Disclaimer: results are estimates for information only. They are not financial, medical or professional advice.